The narrow cut between Kayak Island, where the beachcombing is unsurpassed, and Okalee Spit leads to the ghost town of Katalla, the site of Alaska's first oil discovery. Katalla, once a town of 10,000 residents, has been abandoned since the 1940s, and the forest has since reclaimed it. Just one original house remains there, but all types of artifacts can still be found in the woods. Farther north past the Copper River delta is Orca Inlet, the southern passage into Prince William Sound, and Cordova, which is accessible only by sea or air. The town's 4,000 summertime residents live around a common hub: the sheltered harbor filled with commercial fishing vessels. The area is home to the world's largest population of sea otters, and in summer, pods of killer whales cruise the waters.